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                # 4.9.?小結 `apihelper.py` 程序和它的輸出現在應該非常清晰了。 ``` def info(object, spacing=10, collapse=1): """Print methods and doc strings. Takes module, class, list, dictionary, or string.""" methodList = [method for method in dir(object) if callable(getattr(object, method))] processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s) print "\n".join(["%s %s" % (method.ljust(spacing), processFunc(str(getattr(object, method).__doc__))) for method in methodList]) if __name__ == "__main__": print info.__doc__ ``` `apihelper.py` 的輸出: ``` >>> from apihelper import info >>> li = [] >>> info(li) append L.append(object) -- append object to end count L.count(value) -> integer -- return number of occurrences of value extend L.extend(list) -- extend list by appending list elements index L.index(value) -> integer -- return index of first occurrence of value insert L.insert(index, object) -- insert object before index pop L.pop([index]) -> item -- remove and return item at index (default last) remove L.remove(value) -- remove first occurrence of value reverse L.reverse() -- reverse *IN PLACE* sort L.sort([cmpfunc]) -- sort *IN PLACE*; if given, cmpfunc(x, y) -> -1, 0, 1 ``` 在研究下一章前,確保你可以無困難的完成下面這些事情: * 用[可選和命名參數](optional_arguments.html "4.2.?使用可選參數和命名參數")定義和調用函數 * 用 [`str`](built_in_functions.html#apihelper.str.intro "例?4.6.?str 介紹") 強制轉換任意值為字符串形式 * 用 [`getattr`](getattr.html "4.4.?通過 getattr 獲取對象引用") 動態得到函數和其它屬性的引用 * 擴展列表解析語法實現[列表過濾](filtering_lists.html "4.5.?過濾列表") * 識別 [`and-or` 技巧](and_or.html "4.6.?and 和 or 的特殊性質")并安全地使用它 * 定義 [`lambda` 函數](lambda_functions.html "4.7.?使用 lambda 函數") * 將函數賦值給變量然后通過引用變量調用函數。我強調的已經夠多了:這種思考方式對于提高對 Python 的理解力至關重要。在本書中你會隨處可見這種技術的更復雜的應用。
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